AIR KITS SINGLE AND DOUBLE. SINGLE AIR KITS Capacities to 84,000 CFM Pressures to 6 WG Temperatures to 1000 F.

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1 ULLETIN 631 OCTOER, 2009 SINGLE AND DOULE AIR KITS DOULE AIR KITS Capacities to,000 Pressures to 6 WG Temperatures to 0. SINGLE AIR KITS Capacities to 84,000 Pressures to 6 WG Temperatures to 0. THE NEW YORK LOWER COMPANY 76 Quincy Street Willowbrook, IL Visit us on the Web: Phone: (0) nyb@nyb.com

2 AIR KITS Air Kits are ideal for applications where even air distribution is critical and where plenum construction and space limitations favor slower speed, center-hung fan designs. Sizes 24 to 44 housing. Riveted-wheel construction Sizes 12 to 22. Welded-wheel construction Sizes 24 to 44. DESIGN EATURES Two models to choose from: Single Air Kits in Sizes 12 to 44 for capacities to 84,000. Double Air Kits in Sizes 12 to 33 for capacities to,000. Pressures to 6 WG. Operating temperatures to: 0. with standard wheels. 0. with stainless-steel wheels. orward-curved wheel: Double width-double inlet for maximum capacity. Slow speeds for quiet operation and economical shaft diameters. Time-tested operating clearances for ease of installation and system expansion at operating temperature. Suitable for clockwise and counterclockwise applications. CONSTRUCTION EATURES Housing continuously welded, heavy-gauge steel. Sizes 12 to 22 have streamlined venturi inlets pressed into housing sides. Wheels double width-double inlet with optimized number and spacing of forward-curved blades. Riveted construction in Sizes 12 to 22, welded construction in Sizes 24 to 44. alance all wheels receive a centrifugal precisionbalance prior to shipment. inish high-temperature, industrial-grade coating suitable for applications at 0. Shafting turned, ground, and polished shafting is straightened to close tolerance to minimize run-out and ensure smooth operation. 5-PART SIING NOMENCLATURE EXAMPLE X Wheel diameter [inches]. X = Non-standard Air Kit. No letter = Standard Air Kit. Current design sequence. Shaft diameter [sixteenths of an inch]. 1= Single Air Kit. 2 = Double Air Kit. Copyright 2009 by The New York lower Company. Registered trademark of The New York lower Company. PAGE 2

3 ACCESSORIES MODIICATIONS ACCESS DOOR lush-bolted access door allows for system inspection and ease of wheel removal. Closely spaced studs hold bolted access door firmly against gasketing to minimize leakage. With housing in clockwise Top Horizontal discharge, door available at 6, 9, and 12 o clock positions. SHAT-COOLER ASSEMLY Includes cast-aluminum wheel, cooler cone, and metal guard. Dissipates heat prior to bearings. Recommended for applications 300. and above. SHATING High-quality, hot-rolled, turned, ground, and polished of the appropriate alloy. Keyways and turndowns per specification. SPECIAL-ALLOY CONSTRUCTION Airstream components can be constructed of a wide range of alternate alloys for temperature and corrosion resistance including 304, 316, and 347 stainless steel. EARINGS Pillow-block ball bearings pre-selected by shaft size for extended service life. earing pair includes one fixed and one expansion bearing to allow for thermal growth of the shaft. STRAIGHTENING VANES Installed in Air Kit inlets. Straightening vanes eliminate the need for baffles in closed plenums by preventing the spinning of air at the inlet. OTHER ACCESSORIES Also available from nyb are drive components such as motors and v-belt drives as well as a variety of preventative-maintenance products including vibration detectors and bearing-temperature detectors. Shaft cooler assembly. Air Kit with straightening vanes. Access door at 9 o clock position. ELECTRONIC CATALOG A complete New York lower Catalog on one CD. No more manual calculations and bulky product catalogs. A critical tool for all system-designers and engineers who select and specify air-moving equipment. SELECTION ENEITS CATALOG CONTENTS ast, accurate fan selection. an-selection program. Automatic altitude, temperature, Complete product catalog in PD including and density corrections. drawings, dimensions, and design specifications. Sound levels by octave band. Sample guide specifications. an-performance curves. New York lower Engineering Letters. Multiple model and size choices. Installation and Maintenance Manuals. Metric or English units. Listing of New York lower representatives. To obtain your copy of New York lower s Electronic Catalog contact your local New York lower representative or go to and click on Selection Software. PAGE 3

4 PLENUM DESIGN The capacity tables on pages 7, 8, and 9 are based on laboratory tests of Air Kits without plenums [no restriction to airflow]. When Air Kits are mounted in restricted areas, the performance may be affected. The following plenum information will assist the system designer in identifying and applying the appropriate correction factors to obtain the desired catalog rating. OPEN PLENUM Air enters from more than one direction. CHART I OPEN PLENUM ACTORS Do not use for closed plenums. A in % of wheel diameter Multiply RPM by HP by % or more % % % % or less Poor design Double Air Kit A 2A A A A Single Air Kit CLOSED PLENUM Air enters from only one direction. Air Kit performance will change due to restriction at the inlet or spinning of air into inlet. Spinning can be eliminated by centering fan inlets in plenum, by designing baffles as shown, or by installing optional straightening vanes. When dimension is greater than two times wheel diameter, consider plenum as open type. EST DESIGNS C = D, fan inlet is centered in airflow. C D C POOR DESIGNS an inlets not centered and no baffles used. D C D GOOD DESIGNS ans not centered in airflow but vanes or baffles installed to balance airflow into inlets. Outlet velocity CHART II VELOCITY PRESSURES Velocity pressure Outlet velocity Velocity pressure CLOSED PLENUM EXAMPLE Assume: 30 fpm fan outlet velocity, 4 static pressure, A = % wheel diameter. A in % of wheel diameter VP = SP Velocity Pressure divided by Static Pressure CHART III CLOSED PLENUM CORRECTION ACTORS % 40% % RPM HP RPM HP RPM HP Velocity Pressure from Chart II at 30 PM =.8 2. Velocity Pressure =.8 =.2 Static Pressure rom Chart III multiply RPM by 1.04 and multiply HP by 1.15 PAGE 4

5 AIR KIT ENGINEERING GENERAL Air Kits are an integral part of the ovens and dryers in which they are installed. As such, New York lower sales representatives work closely with OEM project engineers in assessing requirements and meeting critical performance and dimensional specifications. ecause of the wide variety of plenum designs and Air Kit configurations available final selection should be made using New York lower s Electronic Catalog software. SINGLE OR DOULE AIR KITS The choice of a single or double fan arrangement must be made to determine specific fan capabilities. Space availability, uniform air distribution, performance requirements, and past plenum designs must all be considered in the choice of single or double Air Kits. CORRECTION ACTORS an performance is based on actual cubic feet per minute [A] at the fan inlet at standard density [.075 lbs./ft. 3 ] and static pressure at the fan outlet. Static pressure capabilities are shown in inches water gauge [ WG]. Air-density corrections are necessary for proper selection when air density varies from the standard.075 lbs./ft. 3 at. at sea level. Multiply the required static pressure at operating conditions by the appropriate factors in Charts IV and V to obtain the corrected static pressure for standard conditions. Pressure and HP will be reduced at conditions by the inverse of these factors. Multiply one factor by the other if both temperature and altitude are non-standard. or example, if the installation is located at an altitude of 4000 feet and the gas temperature is 300., the correction factor is 1.66 [1.16 x 1.43]. CHART IV ALTITUDE [ft.] CORRECTIONS Altitude actor CHART V TEMPERATURE CORRECTIONS Temp.. actor MATERIALS O CONSTRUCTION Standard, mild-steel, Air Kit construction is generally satisfactory for temperatures up to and 316 stainless steel is available if desired. etween 0. and 0. mild-steel housings are satisfactory; however, wheels must be constructed of stainless steel with hubs of cast iron to limit growth. Chart VI gives the factors to use in correcting maximum wheel and shaft safe speeds at. given in Chart VII and curves on pages 11 to 14. The safe speed of the complete Air Kit is the lower of the corrected wheel and shaft speeds. Temp.. CHART VI AIR KIT WHEEL AND SHAT TEMPERATURE DERATES Wheel Shaft Steel Steel HEAT ANS ans handling hot airstreams must be kept in operation after system shutdown until the airstream cools below 200. to prevent damage to the fan. The fan wheel or shaft might otherwise distort due to heat-soaking. The optional shaft cooler is only effective while rotating. Contact nyb when the application involves temperature changes greater than 20. per minute. Gas and oil burners should be placed such that the air is thoroughly mixed before entering the fan inlet. Placing the burner so that a very hot stream of air enters one fan inlet could cause unusually high temperature and fan failure. High-limit temperature controls should be placed at the fan inlet or inlets. PAGE 5

6 AIR KIT ENGINEERING AND SELECTION EARING EXPANSION Steel shafts expand [316 stainless steel = ] inches per inch of shaft length per degree ahrenheit. This is 1 2 for a 10-foot-long shaft heated 0. Therefore, whenever an Air Kit handles high temperature air, allowances must be made to avoid binding the bearings and causing premature bearing failure. Standard pillow-block bearings do not provide for expansion and can only be used in low-temperature applications or in unusual applications where the bearing supports have the same expansion characteristics as the shaft. Expansion bearings with limited expansion capability are available but most do not offer the degree of expansion required for these applications. nyb offers expansion bearings specifically designed for use with Air Kits. earing pairs include one expansion and one fixed bearing [drive end]. The expansion bearing includes a special high-heat key to allow for thermal expansion. SHATING Any rotating body will exhibit severe vibration when operated at a particular speed called the critical speed. Safe speeds as shown in this bulletin are based on % of this critical speed which is dependent on: earing centers Location and weight of Shaft material [SAE 1040] drive sheave Shaft diameter[s] Location and weight of Temperature of operation wheels The pre-calculated safe speeds given in Chart VII are based on standard dimensions as shown. It is usually possible to design oven construction so that bearing supports and cabinet dimensions meet standard Air Kit dimensions. Any variation from standard dimensions will require a change in safe speeds as indicated on pages Air Kit shafting must be high quality, hot rolled, turned, ground and polished of the appropriate alloy. Expansion and contraction in oven and dryer work aggravates any looseness in the wheel-shaft fit. Cold rolled shafting is not acceptable. Air Kit shafting is straightened after all machining to a maximum runout of.002 inches. PROCEDURES STEPS EXAMPLE: HOW TO SELECT AN AIR KIT Select an Air Kit for an oven requiring 00 at 3 WG at. with operating temperature of 0., 4 walls approximately feet apart in a closed-plenum design. Determine Air Kit size and if one or two fans are to be used. Determine plenum design and bearing-center distance. Correct wheel safe speed for maximum temperature. Check wheel safe speed for maximum temperature. Select shaft size and check shaft speed at operating temperature. Determine if coolers are required. inal selection and operating HP. There are three possible selections: 1. Double Size 12 Air Kit at 2564, 1483 RPM at 7.24 HP. 2. Double Size 15 Air Kit at 2000, 1174 RPM at 6.06 HP. 3. Single Size 18 Air Kit at 2492, 948 RPM at 5.93 HP. Selection 1 has a high HP and. Selection 3 is more efficient but is fairly high. The Double combination of selection 2 gives the best air distribution across oven and is efficient. Use a Double Size 15 Air Kit. Using a predesigned Air Kit package from page 10, the standard wall-to-wall dimension for a Double Size 15 Air Kit is 54 [62 8 ]. rom Chart II, VP/SP =.25/3 =.08. The A dimension for a Double Size 15 Air Kit is 5 or % of the 15 wheel diameter. rom Chart III use.1 as the closest VP/SP to RPM x 1.02 = 1197 RPM 6.06 HP x 1.10 = 6.67 HP [standard air./.075 lb./ft. 3 ] Chart VII shows that a Size 15 wheel has a maximum safe speed of 17 RPM at. Using temperature correction factor from Chart VI at RPM x. = 1424 RPM Maximum safe speed at 0...well above the required 1197 RPM. Required speed is 1197 RPM. Chart VII shows that a Air Kit with 4 wall has a maximum shaft speed of 1555 RPM at. Using the correction factor from Chart VI at 0.: 1555 RPM x.92 = 1430 RPM at 0., well above the 1197 RPM required. ecause the application is above 300. shaft coolers are required. Standard Air Kit with shaft-cooler assemblies, HP at operating temperature of 0. is [Chart V] = 3.15 HP. PAGE 6

7 SIE 12 Wheel diameter: 12.3" Wheel circumference: 3.21' Maximum safe speed = 21 RPM Outlet area: 1.56 sq. ft. RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP SIE 15 Wheel diameter: 15.0" Wheel circumference: 3.93' Maximum safe speed = 17 RPM Outlet area: 2.00 sq. ft. RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP SIE 18 Wheel diameter: 18.3" Wheel circumference: 4.77' Maximum safe speed = 14 RPM Outlet area: 3.21 sq. ft. RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP SIE 22 Wheel diameter: 22.3" Wheel circumference: 5.82' Maximum safe speed = 5 RPM Outlet area: 5.00 sq. ft. RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP Performance shown is for Single Air Kits with outlet ducts and without inlet ducts. or Double Air Kits, multiply and HP by 2. HP does not include belt losses. PAGE 7

8 SIE 24 Wheel diameter: 24.5" Wheel circumference: 6.40' Maximum safe speed = 10 RPM Outlet area: 6.23 sq. ft. RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP SIE 27 Wheel diameter: 27.0" Wheel circumference: 7.06' Maximum safe speed = 9 RPM Outlet area: 7. sq. ft. RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP SIE 30 Wheel diameter: 30.0" Wheel circumference: 7.85' Maximum safe speed = 8 RPM Outlet area: 9.27 sq. ft. RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP SIE 33 Wheel diameter: 33.0" Wheel circumference: 8.63' Maximum safe speed = 810 RPM Outlet area: 11.3 sq. ft. RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP Performance shown is for Single Air Kits with outlet ducts and without inlet ducts. or Double Air Kits, multiply and HP by 2. HP does not include belt losses. PAGE 8

9 SIE 36 Wheel diameter: 36.5" Wheel circumference: 9.55' Maximum safe speed = 735 RPM Outlet area: 13.9 sq. ft. RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP SIE 40 Wheel diameter: 40.3" Wheel circumference: 10.5' Maximum safe speed = 665 RPM Outlet area: 16.9 sq. ft. RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP SIE 44 Wheel diameter: 44.5" Wheel circumference: 11.6' Maximum safe speed = 0 RPM Outlet area: 20.6 sq. ft. RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP Performance shown is for Single Air Kits with outlet ducts and without inlet ducts. or Double Air Kits, multiply and HP by 2. HP does not include belt losses. PLUG ANS Capacities to 74,000, 20 WG. or alternate system designs, New York lower offers an extensive line of space-saving Plug ans featuring high-efficiency backwardly inclined wheels for a wide variety of OEM applications... static pressures to 20 WG...temperatures to to 49 wheel diameters. PAGE 9

10 STANDARD AIR KITS 1" Double Air Kit W A M 2A M A 6" 1" Dimensions in inches. = wall thickness = 4 or 6 See page 15 for detail on dimensions. Dimensions not to be used for construction unless certified. A W M A 6" Single Air Kit earing centers J Shaft H earing centers J Shaft H DOULE AIR KITS SINGLE AIR KITS Size A M CHART VII W H J Shaft diameter Keyways earings Shaft safe RPM Wheel safe 4 wall 6 wall 4 wall 6 wall 4 wall 6 wall Wheel earings 4 wall 6 wall RPM x 3 16 SPM x 3 16 SPM x 3 16 SPM x 1 4 SPM x 1 4 SPM x 1 4 SPM x 1 4 SPM x 5 16 SPM x 5 16 MPD x 5 16 MPD x 5 16 MPD x 3 16 SPM x 1 4 SPM x 5 16 MPD x 1 4 SPM x 5 16 SPM x 1 4 SPM x 1 4 SPM x 5 16 MPD x 5 16 SPM x 5 16 MPD x 1 4 SPM x 5 16 SPM x 5 16 MPD x 1 4 SPM x 5 16 SPM x 5 16 MPD x 5 16 MPD x 3 8 MPD x 1 4 SPM x 5 16 SPM x 5 16 MPD x 5 16 MPD x 3 8 MPD x 3 8 MPD x 5 16 SPM x 5 16 MPD x 5 16 MPD x 3 8 MPD x 3 8 MPD x 5 16 MPD x 5 16 MPD x 3 8 MPD x 3 8 MPD dimensions shown in detail on page 15. Safe speed of shaft exceeds safe speed of wheel. Safe speeds are given at. See Chart VI, page 5, for temperature correction. * PAGE 10

11 NON-STANDARD AIR KITS When the system plenum cannot be designed to accommodate pre-designed, standard Air Kits [from Chart VII], Air Kits with nonstandard shaft sizes and wheel bores may be selected using the shaft safe speed curves on pages 11 to 14. 1" W A M 2A M A K 1" A W M A K The curves show maximum shaft safe speeds at. for all possible bearing-center distances and Air Kit combinations. inal selections must be corrected for operating temperature. Curves are based on proper spacing of fans between walls [A on each side and 2A between fans]. Curves cannot be extended to obtain selections not shown. earing centers J H Shaft Double Air Kit earing centers J Shaft H Single Air Kit See page 4 for A dimension criteria. See page 15 for, K, and M dimension criteria. HOW TO SELECT A NON-STANDARD AIR KIT PROCEDURES STEPS EXAMPLE Summary. Air Kit size and model have been selected from the example on page 6. Plenum effect has been calculated and speed and HP determined. Wheel safe speed at 0 had been checked. Calculate bearing-center distance. Select shaft size and check shaft safe speed at operating temperature. inal selection. Inside wall-to-wall distance is 54. Wall thickness is 4 for a total W of 62. Use dimension from Chart VII for Double Air Kit with closest W dimension. = 3. earing centers for using curves is 65. Using the X15-2 graph, draw a horizon line from 65 and a vertical line from 1197 RPM. Correct selection is the curve that is above the intersection point with a maximum safe speed of 1310 at. [continue the horizontal line], 1310 x.92 [Chart = 5 RPM. An X Air Kit with cooler wheels. X12-1 SINGLE AIR KIT X12-2 DOULE AIR KIT PAGE 11

12 NON-STANDARD AIR KITS X15-1 SINGLE AIR KIT X15-2 DOULE AIR KIT X18-1 SINGLE AIR KIT X18-2 DOULE AIR KIT X22-1 SINGLE AIR KIT X22-2 DOULE AIR KIT PAGE 12

13 NON-STANDARD AIR KITS X24-1 SINGLE AIR KIT X24-2 DOULE AIR KIT X27-1 SINGLE AIR KIT X27-2 DOULE AIR KIT X30-1 SINGLE AIR KIT 140 X30-2 DOULE AIR KIT PAGE 13

14 NON-STANDARD AIR KITS 140 X33-1 SINGLE AIR KIT X33-2 DOULE AIR KIT X36-1 SINGLE AIR KIT 1 X40-1 SINGLE AIR KIT X44-1 SINGLE AIR KIT SPECIICATIONS STANDARD SHEET GAUGE, WHEEL WEIGHTS [RPM] Size Housing Wheel Side Scroll ack ront plate plate lades Weight Inlet cone PAGE 14

15 DRAWINGS/DIMENSIONS [INCHES] Not to be used for construction unless certified. HOUSINGS EARINGS M C SIES W D DD G G A H E E Size C D DD E G M W SIES M W D G E C Shaft size earing type C A C D E G H SPM SPM SPM SPM MPD MPD TYPICAL EARING MOUNTING DETAIL Wheel/cone gap must be large enough to account for shaft expansion D Size C D E G M W Stud circle Inlet cone Plenum wall Shaft-cooler guard Shaft-cooler wheel K 1/ 2" Tolerance: ± 1 8 SHAT COOLERS C Expansion bearing Shaftcooler cone Housing Wheel ixed bearing Turndown 1" inside Shaftcooler plenum wall cone D A E Gap must be large enough so that turndown does not contact bearing after expansion 6-1 / 2" diameter holes ore* A C D E * Shaft-cooler bore should be same as wheel bore. Tolerance: ± 1 8 Optional preselected bearings are available with nyb Air Kits. However, it is recognized that some customers may have bearing specifications other than available through nyb. The detail shown here provides dimension information and a suitable method of construction. The dimensions for Standard Air Kits are given in Chart VII, page 10. = Nominal width of bearing bar. K = Shaft extension for drive is based on placing sheave as close to bearing bar as possible. Speeds in Chart VII and on curves pages are based on 1 2 maximum. PAGE 15

16 COMPLETE SELECTION O AIR-MING EQUIPMENT The New York lower Company offers thousands of different types, models, and sizes of air-moving equipment. Contact your nyb representative for assistance in identifying the best fan for your application. AIR-HANDLING [AXIAL] or the ideal handling of clean to moderately dirty airstreams. Commercial and industrial HVAC, drying and cooling systems, fume extraction, and process-heat removal are typical applications. DUST/MATERIAL HANDLING Wide range of duty available with unique fan lines capable of handling light dust to heavy material. Typical applications include dust-collection and high-pressure process along with material-conveying. AIR-HANDLING [CENTRIUGAL] Designed for clean to moderately dirty gas streams. Commercial and industrial HVAC, process cooling, light material-conveying, heat removal, and dryer exhaust are just a few of the numerous sample applications IERGLASS REINORCED PLASTIC [RP] Choice of performance and duty for corrosive gas streams. Applications include chemical process, wastewater treatment, laboratory hood exhaust, and tank aeration. CUSTOM PRODUCTS Designed for unique applications. Variety of configurations, temperatures, flows, and pressures. Wide range of modifications and accessories are available to meet the most demanding specifications. Leading the industry forward since 1889 ROO VENTILATORS Including both hooded and upblast ventilators, propeller fans, and centrifugal roof exhausters. These units are ideal for industrial, commercial, and institutional applications. HEATING PRODUCTS Industrial-duty steam unit heaters with steam heating coils are available for facility heating and process-heat transfer. PROCESS/AN COMPONENTS Plug fans, plenum fans, wheels, inlet cones, and housings for a wide variety of OEM applications. Process/fan components are used in air-handling units, ovens, dryers, freezer tunnels, and filtration systems.